Proteins useful in the regulation of κB-containing genes

ABSTRACT

Proteins, and corresponding DNA and RNA sequences, useful for the regulation of expression of κB-containing genes are disclosed. These proteins are useful to either stimulate or inhibit the expression of κB-containing genes. Proteins stimulating the expression of κB-containing genes have an amino acid sequence at least 80% identical to the amino acid sequence of from position 1 to position 374 of p100  SEQ ID NO: 2!. Proteins having an inhibitory effect on the expression of κB-containing genes have sequences either at least 80% identical to the amino acid sequence of from position 407 to the carboxyl end of p100  SEQ ID NO: 2! or having an amino acid sequence at least 80% identical to the amino sequence of either from position 1 to 100 sor from position 101 to position 374 of p100  SEQ ID NO: 2!.

The technology described in this document is in part based on work funded by the National Institute of Health (Grant Nos. AI26864 and AI29179).

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to genetic sequences and proteins useful in the regulation of genes, particularly in the regulation of κB-containing genes.

2. Discussion of the Background

A twice-repeated 11-base-pair sequence, termed κB, which is known to exist in association with the enhancer of the immunoglobulin κ light chain (Sen et al, Cell (1986) 46:705, Sen et al, Cell (1986) 47:729) is present in the control elements of numerous genes, including both vital and cellular genes. NF-κB, a regulatory element originally described as a transcription factor that recognizes the κB element of the immunoglobulin (Ig) κ light chain enhancer and which is known to be associated with κ light chain expression, has been found in a variety of vital enhancers, including SV40, CMV, HIV-2 and SIV. κB-related sites have been found in association with several cellular genes, including class I and II MHC genes, IL-2, IL-2 receptor (IL-2Rα), serum amyloid A, β-2 micro-globulin, β-interferon, tumor necrosis factor, and T-cell receptor genes.

A κB-like site contributes functionally to IL-2-dependent gene expression and may also regulate IL-2Rα transcription. κB is also found among the regulatory elements upstream of the HIV enhancer. This site was initially identified as a positive regulatory element recognized by DNA binding proteins found to be present in activated, but not resting, T cells. Mutation of the κB sites abolished inducibility of the HIV enhancer in T leukemia cells. A link between the κB site and the tat-I gene was also suggested by the synergistic response of the HIV enhancer to tat-I and NF-κB-mediated stimulation.

Another κB-like site was found upstream of the class I MHC gene. Although this site competes for binding to NF-κB, a DNA binding protein distinct from NF-κB has been identified in MEL and HeLa cells. Baldwin et al, Proc. Nat. Acad. Sci. (USA) (1988) 85:723. This protein, termed H2TF1, was detected in nuclear extracts containing no detectable NF-κB binding activity and had a different apparent molecular weight as measured by UV-cross-linking analysis. Another protein, designated KBF1, also recognized this site and may be related in part to NF-κB. Israel et al, Proc. Nat. Acad. Sci. (USA) (1987) 84:2653, Yanno et al, EMBO J (1987) 6:3317.

Although these proteins recognize κB-like sites, their relationship to the IL-2R κB binding protein(s) and NF-κB is unknown. Similarly, the HIVen86 protein is likely to be distinct from NF-κB since it has a higher apparent molecular weight. Franza et al, Nature (1987) 330:391. Its relationship to the IL-2R κB binding protein, which has been designated RκB (NF-rκB), and its role in mediating transactivation dependent on these κB-like sites is also not yet understood. Although the evidence is indirect, it appears that HIVen86 also differs from RκB, which has a higher apparent molecular weight of 100 kD.

While extensive sequence similarity to κB is found among enhancers associated with several genes (Lung et al, Nature (1988) 333:776), a second characteristic shared by these sites is their ability to respond to transactivation by the tax₁ gene of HTLV-1. At the same time, several lines of evidence suggest differences among κB binding proteins. For example, nuclear extracts from MEL cells display an H2TF1 binding activity in the absence of detectable NF-κB binding. Competition studies showed that both the IL-2RκB and κB sites compete less efficiently than H2TF1 for binding to the site, consistent with previous studies suggesting that a distinct binding protein binds to the H2TF1 site.

Analysis of binding proteins by UV-cross-linking and SDS-page has also revealed multiple radiolabeled complexes, further implicating multiple proteins in κB binding. By UV-cross-linking, several specific complexes have been detected, including proteins of molecular weights of ca. 160, ca. 90, ca. 75, and ca. 50 kD. There is no evidence for differential regulation of these proteins by different NF-κB stimulants since PMA, TNF-α, and IL-1 induce the same set of complexes. The complex of ca. 50 kD is consistent with previous report of NF-κB and/or κBF1. Although a κB binding protein of 86 kD HIVen86A, has also been identified by two-dimensional gel electrophoresis, it is unclear whether the ca. 90 kD protein represents this protein. Both HIVen86 and RκB show no increase in binding following cellular activation. The 160 kD complex has not been previously described.

In summary, at least seven κB binding proteins have been defined to date by either mobility shift analysis, UV-crosslinking, or protein purification. The molecular weight of these proteins range in size from 48 to greater than 300 kD. The various κB binding proteins that have been reported are indicated in Table 1 below, together with their relative specificities for the canonical κB, the class I MHC, and the IL-2RκB sites.

                  TABLE 1                                                          ______________________________________                                         Summary of κB Binding Proteins                                                                      Protein  cDNA                                       Name       Specificity     (kD)     (kb)                                       ______________________________________                                         NF-κB/KBFI                                                                          κB = MHC = IL-2RκB                                                                 50       4                                          H2TF-1     MHC > κB > IL-2RκB                                                                 110      --                                         EBP-1      MHC = κB  60       --                                         HIVen86    κB = IL-2RκB                                                                       86       --                                         MBP-1      MHC > κB > IL-2RκB                                                                 ˜300                                                                              9.5                                        RκB (IL-2RκB)                                                                 IL-2RκB > κB > MHC                                                                 95       5.5                                        ______________________________________                                    

Of these, the cDNAs encoding three of these proteins have been isolated. These cDNAs differ from one another by primary sequence and react with mRNAs of distinct size by northern blot. Taken together, these data indicate that multiple proteins could bind to a set of κB-related sites. Thus, there is a family of κB binding proteins, which, unlike some DNA binding proteins (e.g., c-jun), do not appear to be members of a related multigene family.

The κB sequence is known to exist in association with the regulatory elements of various viral and cellular genes. In light of the obvious interest in regulating gene expression there is accordingly a need for a factor useful in the regulation of κB-containing genes.

SUMMARY OF THE INVENTION

Accordingly, it is an object of this invention to provide novel factors, and materials and methods useful for obtaining and using such factors, useful in the regulation of κB-containing genes.

The above objects, of the invention, and other objects which will become apparent from the description of the invention given hereinbelow, have been surprisingly found to be satisfied by proteins having amino acid sequences related to p49 SEQ ID NO: 1! and p100 SEQ ID NO: 1!. More particularly, the inventors have discovered that proteins having amino acid sequences at least 80%, preferably at least 90% and more preferably at least 95%, identical to either (i) the sequence of from amino acid position about 1 to amino acid position about 374 and up to the complete sequence of p49 SEQ ID NO: 1! or (ii) the sequence of from amino acid position about 1 to amino acid position about 374 and up to amino acid position about 500 of p100 SEQ ID NO: 2! are useful to stimulate the expression of κB-containing genes. The inventors have also discovered related proteins useful in inhibiting the expression of κB-containing genes. These proteins may be characterized by amino acid sequences at least 80%, preferably at least 90% and more preferably at least 95%, identical to the sequence of from amino acid position about 407 of p100 SEQ ID NO: 2!. The proteins exhibiting the inhibitory effect may also be characterized by amino acid sequences at least 80%, preferably at least 90% and more preferably at least 95%, identical to the sequence of from either (i) amino acid positions about 1 to about 190 or (ii) positions about 191 to about 374 of p100 SEQ ID NO: 2! and up to about complete p100 SEQ ID NO: 2!.

BRIEF DESCRIPTION OF THE FIGURES

The figures set forth the deduced amino acid sequence of the p49 SEQ ID NO: 1! and p100 SEQ ID NO: 2! NF-κB proteins--two proteins provided by the invention--and their similarity to other NF-κB/rel/dorsal gens. More particularly, FIG. 1 provides a schematic comparison of the major structural features of p49 SEQ ID NO: 1! and p100 SEQ ID NO: 2!. . .FIG. 2 provides the deduced amino acid sequence of p49 SEQ ID NO: 1! and p100 SEQ ID NO: 2! and comparison to p105 NF-κB SEQ ID NO: 3!..!.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The transcription factor NF-κB is a protein complex which comprises a DNA-binding subunit and an associated transactivation protein (of relative molecular masses 50,000 (50K) and 65K, respectively). Both the 50K and 65K subunits have similarity with the rel oncogene and the Drosophila maternal effect gene dorsal. The 50K DNA-binding subunit was previously thought to be a unique protein, derived from the 105K gene product (p105). The present invention is based on the inventor's discovery of a complementary DNA (cDNA) that encodes an alternative DNA-binding subunit of NF-κB. This cDNA is more similar to p105 NF-κB than other family members and defines a new subset of rel-related genes.

It is synthesized as a ca.100K protein (p100) that is expressed in different cell types, contains cell cycle motifs and, like p105, must be processed to generate a 50K form. A 49K product (p49) can be generated independently from an alternatively spliced transcript; it has specific κB DNA-binding activity and can form heterodimers with other rel proteins. In contrast to the ca.50K protein derived from p105, p49 acts in synergy with p65 to stimulate the human immunodeficiency virus (HIV) enhancer in transiently transfected Jurkat cells. The p49/p100 NF-κB is therefore important in the regulation of κB-contalning genes, including HIV.

The present invention accordingly provides proteins useful in the regulation of κB-containing genes. These proteins may be used to either stimulate or inhibit the expression of κB-containing genes. These proteins are based on the inventor's discovery that the amino acid sequence located at positions about 1 to about 374 of p49 SEQ ID NO: 1! and up to the complete sequence of p49 SEQ ID NO: 1!, simulates the expression of κB-containing genes. (Note that p49 SEQ ID NO: 1! and p100 SEQ ID NO: 2! are identical from positions 1 to 374.) The inventor has further discovered that the amino acid sequence found at about positions about 1 to about 190 of p100 SEQ ID NO: 2! is a DNA binding domain and that the amino acid sequence found at positions about 191 to about 374 of p100 SEQ ID NO: 2! is a dimerization interface. And the inventor has still further discovered that the amino acid sequence found at position about 407 of p100 SEQ ID NO: 2! going all the way to about the carboxyl terminal of the protein is also capable of inhibiting the expression of κB-containing genes.

The proteins provided by the present invention which accordingly act to stimulate κB-containing genes have in amino acid sequence at least 80% identical (i.e. up to 20% of the amino acids have been changed, deleted, or both), preferably 90% identical, and most preferably 95% identical, to the amino acid sequence of amino acid positions about 1 to about 374 of either p49 SEQ ID NO: 1! or p100 SEQ ID NO: 2! and optionally up to about the complete sequence of p49 SEQ ID NO: 1! or up to amino acid position about 500 of p100 SEQ ID NO: 2!.

Proteins useful in inhibiting κB-containing genes provided by the invention are of two related types. The first is a transdominant mutant of p49 SEQ ID NO: 1! in which either (i) the dimerization interface region of p49 SEQ ID NO: 1! has been retained (located at positions about 191 to about 374 of p100 SEQ ID NO: 2!) or (ii) the DNA binding region (located in positions about 1 to about 190 of p100 SEQ ID NO: 2!) has been retained. In either of these two embodiments the other (i.e. unretained) region has been either removed or altered to cause loss of DNA binding or of dimerization activity, e.g., by removing or replacing at least 10 % of its amino acids, preferably at least 25% of its amino acids, to achieve removal of DNA binding or dimerization activity.

This transdominant mutant of p49 SEQ ID NO: 2! may be a protein having in amino acid sequence at least 80% identical, preferably 90% identical, and most preferably 95% identical, to either (i) the amino acid sequence of amino acid positions about 1 to about 190 or (ii) the amino acid sequence of amino acid positions about 191 to about 374 of either p49 or p100 SEQ ID NO: 1 or 2! and optionally up to the complete p49 SEQ ID NO: 1! or complete p100 SEQ ID NO: 2!. That is, if the protein is one in which the DNA binding region has been altered or removed, the protein may further comprise, attached to its carboxyl end, an amino acid sequence at least 80% identical, preferably 90% identical, and more preferably 95% identical to up to 100%, the amino acid sequence of from positions 374 to the carboxyl end of p100 SEQ ID NO: 2!.

With the above transdominant mutant of p49 SEQ ID NO: 1! one uses either the protein segment comprising the DNA binding region or the protein segment comprising the dimerization interface region of p49 SEQ ID NO: 1!. The DNA binding region may be used by itself or it may be used in association with an inactivated dimerization interface, where the inactivation results from removal of at least 10%, or preferably 25% amino acids from the dimerization interface region. If a protein segment corresponding to the dimerization interface region is used, it may be used by itself or in association with an inactivated DNA binding region, where inactivation is caused by the removal of at least 10%, preferably at least 25% of the amino acids from the DNA binding region.

Another group of κB inhibiting proteins provided by the present invention have an amino acid sequence at least 80% identical, preferably 90% identical, and most preferably 95% identical to the sequence of ammo acid at positions about 407 of p100 SEQ ID NO: 2! to about the carboxy end of p100 SEQ ID NO: 2!.

The present invention also provides DNA and RNA sequences encoding to the above proteins, corresponding antisense RNA sequences, vectors useful to express these proteins, and both eukaryotic and prokaryotic cells containing these DNA and/or RNA sequences, further optionally containing a κB-containing gene.

The antisense RNA sequences provided by the present invention may be one of five different types. The first is an antisense RNA sequence which is at least 20 nucleotides-long and corresponds to an amino acid sequence falling within positions 1 to 374 of p49 SEQ ID NO: 1!, inclusive. The second is an antisense RNA sequence which is at least 20 nucleotides-long and corresponds to an amino acid sequence falling within the sequence of p49 SEQ ID NO: 1!. The third is an antisense RNA sequence which is at least 20 nucleotides-long and corresponds to an amino acid sequence falling within the sequence of p100 SEQ ID NO: 2!. The fourth is an antisense RNA sequence which is at least 20 nucleotides-long which corresponds to an amino acid sequence falling within the sequence of from position 375 to the carboxyl end of p49 SEQ ID NO: 1!, inclusive. The fifth is an antisense RNA sequence which is at least 20 nucleotides-long and corresponds to an amino acid sequence falling within positions 375 to the carboxyl end of p100 SEQ ID NO: 2!, inclusive.

These antisense RNA sequences may be used in accordance with known techniques (see, e.g., Zamecnik et al, Proc. Nat. Acad. Sci. (USA), (1986) 83:4143-4146) to inhibit or block cellular expression of the genes encoding either p49 SEQ ID NO: 1! or p100 SEQ ID NO: 2!. More particularly the above first, second and third antisense RNA sequences may be used to inhibit or block expression of either p49 SEQ ID NO: 1! or p100 SEQ ID NO: 2!. The fourth antisense RNA sequence may be used to inhibit or block expression of p49 SEQ ID NO: 1! because it is drawn to a sequence unique to p49 SEQ ID NO: 1!. The above fifth antisense RNA sequence may be used to inhibit or block expression of p100 SEQ ID NO: 2! because it is drawn to a sequence unique to p100 SEQ ID NO: 2!.

The eukaryotic and prokaryotic cells provided by the present invention contain the DNA and/or RNA sequences encoding a present protein, optionally together with a κB-containing gene. These latter sequences (i.e., the sequences containing the κB sites) are present in these cells in a geometry permitting regulation of the κB-containing gene by the proteins of the present invention.

The p49/p100 subunit of NF-κB provided by the invention can be used to regulate the expression of recombinant genes in eukaryotic or prokaryotic cells. In one form of this method, the p49/p100 gene can be overexpressed in a host cell which contains a separate κB-dependent enhancer to express a given recombinant gene. When the p49 gene is overexpressed, the κB-regulated enhancer will stimulate expression of the recombinant gene of interest.

In another method, it is possible to use the κB site to block transcriptional activation. By placing the κB binding sites within a promoter near the transcriptional initiation site, it would interfere with transcriptional initiation or elongation when the recombinant p49/p100 proteins could bind to these sites. It is therefore possible to inhibit expression of a specific recombinant gene when this molecule is overexpressed.

Another way to regulate expression of recombinant genes within cells is to make a fusion protein between p49 (or p100) gene products, for example, the DNA binding and dimerization domains and fuse them to an acidic transactivation domain, such as that of the herpesvirus transactivator, VP16. Such chimeric constructs would provide a high level of constitutive transactivation to κB-dependent plasmids.

Several such plasmids can be synthesized whereby fusion proteins have been linked to the 3'-end of either p49 or an equivalent of p100, creating potent transactivators. Such chimeric transactivators can also be used to overexpress recombinant proteins with cells.

The NF-κB-related DNA and RNA or protein sequences provided by the inventors can be utilized for a variety of different functions. First, the recombinant protein can be used to generate antibodies against this gene product to detect this protein within cells or tissues. Since these proteins are involved in the regulation of HIV and may also be related to cell division and malignancy, this would provide a useful assay to determine the degree of progression of HIV or the degree of activation of malignant cells.

In addition, the DNA or RNA sequences can be measured directly following HIV infection as an indicator of the activity of virus within cells. In recent studies, the inventors have noted a decrease in p100 expression following HIV infection in cell culture. The recombinant proteins can also be used to generate transdominant mutants which can be used to inhibit activation of HIV, normal cellular genes, or cell replication. The purified recombinant proteins may also be used to define mechanisms of transcriptional activation in the laboratory to determine the specificity of DNA binding, and to determine the 3-dimensional structure of these proteins for further attempts at molecular modeling and rational drug design.

Cultures of E. coli XL-blue cells transformed with bluescript plasmids containing p49 SEQ ID NO: 1! or p100 SEQ ID NO: 2! encoding inserts have been deposited in the permanent culture collection of the American Type Culture Colection (ATCC), located at 12301 Parklawn Drive, Rockville, Md. 20852 USA, on Aug. 20, 1991. These cultures have been accorded the following accession numbers: 68672 and 68673.

Having generally described this invention, a further understanding can be obtained by reference to certain specific examples which are provided herein for purposes of illustration only and are not intended to be limiting unless otherwise specified.

Experimental

To characterize the molecular structure of NF-κB and its mechanism of activation, the inventor attempted to identify cDNAs that encode proteins within this complex. Trypsin digested κB binding proteins purified from bovine spleen were sequenced. Three peptides so obtained were identical to a DNA binding subunit of human NF-κB/κBF1, while another was 75% identical to a homologous peptide of p105. This peptide sequence suggested the existence of an alternative NF-κB protein. A PCR probe amplified from degenerate primers was found to be identical to a 700 bp fragment of human c-rel and was used for low stringency hybridization.

From 6×10⁵ recombinants, two clones were identified which hybridized at low stringency. By Southern blot analysis at high stringency, this gene was present in single copy, and Northern blot analysis revealed at least two hybridizable RNA species of ˜1.9 kb and ˜3.5 kb, demonstrating that multiple species of p49 existed, and their relative abundance varied among different cell types. For example, the larger 3.5 kb species, found in all cells examined, was the predominant form in YT T leukemia cells; but both transcripts were present equally in the JY B cell line.

To characterize the larger mRNA species, additional cDNA clones were isolated and sequenced. The clone for the shorter transcript contained a 1341 bp open reading frame, predicting a protein of MW ˜49,100. The longer clone encoded a protein of predicted MW, ˜100,634 kd. These sequences were identical through amino acid 374, into the glycine-rich putative hinge region, after which they diverged. The amino acid sequence in the common N-terminal region was similar (26% identity) to NF-κB, dorsal and rel, with greatest similarity between p49/p100 and p105 (60% identity). One subregion contained conserved cysteine and histidine residues that do not form a classic zinc finger structure. Interestingly, κB-binding activity is dependent upon zinc, and, analogous to the tat-I gene of HIV, may form an alternative structure which participates in dimerization or nucleic acid binding. The longer transcript contained repeated sequences in the C-terminal region with homology to motifs in p105 and cell cycle genes. Among these family members, p100 NF-κB is most closely related to p105 NF-κB (41% identity), while p65 is most similar to c-rel (50% identity).

To characterize the DNA binding activity of the p49 cDNA, the electrophoretic mobility shift assay (EMSA) was performed using a prokaryotic expression system. The predominant product of ˜49 kd displayed specific κB binding activity which was competed by the H-2 and HIV κB sites, but not by a single base pair mutant of HIV or an unrelated IL-2 octamer site. Interaction of p49 with other rel family members was examined by immunoprecipitation in a wheat germ co-translation system similar to p105(Xba I), p49 associated with c-rel.

To determine whether p49 interacts with other NF-κB/rel proteins to stimulate transcription, eukaryotic expression vectors were transfected into Jurkat cells. Transfection of p49 alone stimulated κB enhancer activity slightly, while p65 at higher concentrations significantly increased κB-dependent transcription. Transfection of low amounts (≦1 μg) of either p49 or p65 caused minimal stimulation, but when co-transfected together, they acted in synergy to stimulate a κB reporter plasmid. This stimulation was more effective than the combination of "p50" p105(Rsa I)! and p65, suggesting that p49 was more effective in cooperating with p65. When analyzed with the HIV-CAT reporter, the p49/p65 combination, but not p50 p105(Rsa I)!/p65, stimulated HIV-CAT activity, and the effect required an intact κB regulatory element. A truncated p100 (48.5 kd form) showed similar stimulation, in contrast to full-length p100 which was inactive, suggesting that differences in the rel-conserved domain mediate this effect.

These findings demonstrate that κB-dependent transcription is regulated by the p49/100 gene products. p65 and tel are putative transcriptional activation subunits with intrinsic DNA binding activity which associate with another DNA binding subunit, previously thought to be a single gene product derived from p105. These findings suggest that p49/100 represents an alternative DNA binding subunit of NF-κB which synergizes effectively with p65 to activate κB-dependent transcription. Many proteins can bind to κB-related sites, some of which are not NF-κB/rel-related. Although a variety of κB-binding proteins have been defined biochemically, their identification has remained equivocal since related antigenic epitopes are contained in their amino terminal region. As with p49/100, the identification of these cDNAs allows more definitive analysis of their expression and function. The interaction of p49/100 with other proteins and its potential alternative modes of regulation may provide additional mechanisms to regulate the transcription of HIV and different κB-containing genes.

Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.

    __________________________________________________________________________     .Iadd.SEQUENCE LISTING.Iaddend.                                                .Iadd.(1) GENERAL INFORMATION:.Iaddend.                                        .Iadd.(iii) NUMBER OF SEQUENCES: 3.Iaddend.                                    .Iadd.(2) INFORMATION FOR SEQ ID NO:1:.Iaddend.                                .Iadd.(i) SEQUENCE CHARACTERISTICS:.Iaddend.                                   .Iadd.(A) LENGTH: 447 amino acids.Iaddend.                                     .Iadd.(B) TYPE: amino acid.Iaddend.                                            .Iadd.(D) TOPOLOGY: unknown.Iaddend.                                           .Iadd.(ii) MOLECULE TYPE: protein.Iaddend.                                     .Iadd.(xi) SEQUENCE DESCRIPTION: SEQ ID NO:1:.Iaddend.                         .Iadd.MetGluSerCysTyrAsnProGlyLeuAspGlyIleIleGluTyrAsp.Iaddend.                .Iadd.151015.Iaddend.                                                          .Iadd.AspPheLysLeuAsnSerSerIleValGluProLysGluProAlaPro.Iaddend.                .Iadd.202530.Iaddend.                                                          .Iadd.GluThrAlaAspGlyProTyrLeuValIleValGluGlnProLysGln.Iaddend.                .Iadd.354045.Iaddend.                                                          .Iadd.ArgGlyPheArgPheArgTyrGlyCysGluGlyProSerHisGlyGly.Iaddend.                .Iadd.505560.Iaddend.                                                          .Iadd.LeuProGlyAlaSerSerGluLysGlyArgLysThrTyrProThrVal.Iaddend.                .Iadd.65707580.Iaddend.                                                        .Iadd.LysIleCysAsnTyrGluGlyProAlaLysIleGluValAspLeuVal.Iaddend.                .Iadd.859095.Iaddend.                                                          .Iadd.ThrHisSerAspProProArgAlaHisAlaHisSerLeuValGlyLys.Iaddend.                .Iadd.100105110.Iaddend.                                                       .Iadd.GlnCysSerGluLeuGlyIleCysAlaValSerValGlyProLysAsp.Iaddend.                .Iadd.115120125.Iaddend.                                                       .Iadd.MetThrAlaGlnPheAsnAsnLeuGlyValLeuHisValThrLysLys.Iaddend.                .Iadd.130135140.Iaddend.                                                       .Iadd.AsnMetMetGlyThrMetIleGlnLysLeuGlnArgGlnArgLeuArg.Iaddend.                .Iadd.145150155160.Iaddend.                                                    .Iadd.SerArgProGlnGlyLeuThrGluAlaGluGlnArgGluLeuGluGln.Iaddend.                .Iadd.165170175.Iaddend.                                                       .Iadd.GluAlaLysGluLeuLysLysValMetAspLeuSerIleValArgLeu.Iaddend.                .Iadd.180185190.Iaddend.                                                       .Iadd.ArgPheSerAlaPheLeuArgAlaSerAspGlySerPheSerLeuPro.Iaddend.                .Iadd.195200205.Iaddend.                                                       .Iadd.LeuLysProValThrSerGlnProIleHisAspSerLysSerProGly.Iaddend.                .Iadd.210215220.Iaddend.                                                       .Iadd.AlaSerAsnLeuLysIleSerArgMetAspLysThrAlaGlySerVal.Iaddend.                .Iadd.225230235240.Iaddend.                                                    .Iadd.ArgGlyGlyAspGluValTyrLeuLeuCysAspLysValGlnLysAsp.Iaddend.                .Iadd.245250255.Iaddend.                                                       .Iadd.AspIleGluValArgPheTyrGluAspAspGluAsnGlyTrpGlnAla.Iaddend.                .Iadd.260265270.Iaddend.                                                       .Iadd.PheGlyAspPheSerProThrAspValHisLysGlnTyrAlaIleVal.Iaddend.                .Iadd.275280285.Iaddend.                                                       .Iadd.PheArgThrProProTyrHisLysMetLysIleGluArgProValThr.Iaddend.                .Iadd.290295300.Iaddend.                                                       .Iadd.ValPheLeuGlnLeuLysArgLysArgGlyGlyAspValSerAspSer.Iaddend.                .Iadd.305310315320.Iaddend.                                                    .Iadd.LysGlnPheThrTyrTyrProLeuValGluAspLysGluGluValGln.Iaddend.                .Iadd.325330335.Iaddend.                                                       .Iadd.ArgLysArgArgLysAlaLeuProThrPheSerGlnProPheGlyGly.Iaddend.                .Iadd.340345350.Iaddend.                                                       .Iadd.GlySerHisMetGlyGlyGlySerGlyGlyAlaAlaGlyGlyTyrGly.Iaddend.                .Iadd.355360365.Iaddend.                                                       .Iadd.GlyAlaGlyGlyGlyGluGlyValLeuMetGluGlyGlyValLysVal.Iaddend.                .Iadd.370375380.Iaddend.                                                       .Iadd.ArgGluAlaValGluGluLysAsnLeuGlyGluAlaGlyArgGlyLeu.Iaddend.                .Iadd.385390395400.Iaddend.                                                    .Iadd.HisAlaCysAsnProAlaPheGlyArgProArgGlnAlaAspTyrLeu.Iaddend.                .Iadd.405410415.Iaddend.                                                       .Iadd.ArgSerGlyValGlnAspGlnLeuGlyGlnGlnArgGluThrSerSer.Iaddend.                .Iadd.420425430.Iaddend.                                                       .Iadd.LeuLeuLysIleGlnThrLeuAlaGlyHisGlyGlyArgArgLeu.Iaddend.                   .Iadd.435440445.Iaddend.                                                       .Iadd.(2) INFORMATION FOR SEQ ID NO:2:.Iaddend.                                .Iadd.(i) SEQUENCE CHARACTERISTICS:.Iaddend.                                   .Iadd.(A) LENGTH: 899 amino acids.Iaddend.                                     .Iadd.(B) TYPE: amino acid.Iaddend.                                            .Iadd.(D) TOPOLOGY: unknown.Iaddend.                                           .Iadd.(ii) MOLECULE TYPE: protein.Iaddend.                                     .Iadd.(xi) SEQUENCE DESCRIPTION: SEQ ID NO:2:.Iaddend.                         .Iadd.MetGluSerCysTyrAsnProGlyLeuAspGlyIleIleGluTyrAsp.Iaddend.                .Iadd.151015.Iaddend.                                                          .Iadd.AspPheLysLeuAsnSerSerIleValGluProLysGluProAlaPro.Iaddend.                .Iadd.202530.Iaddend.                                                          .Iadd.GluThrAlaAspGlyProTyrLeuValIleValGluGlnProLysGln.Iaddend.                .Iadd.354045.Iaddend.                                                          .Iadd.ArgGlyPheArgPheArgTyrGlyCysGluGlyProSerHisGlyGly.Iaddend.                .Iadd.505560.Iaddend.                                                          .Iadd.LeuProGlyAlaSerSerGluLysGlyArgLysThrTyrProThrVal.Iaddend.                .Iadd.65707580.Iaddend.                                                        .Iadd.LysIleCysAsnTyrGluGlyProAlaLysIleGluValAspLeuVal.Iaddend.                .Iadd.859095.Iaddend.                                                          .Iadd.ThrHisSerAspProProArgAlaHisAlaHisSerLeuValGlyLys.Iaddend.                .Iadd.100105110.Iaddend.                                                       .Iadd.GlnCysSerGluLeuGlyIleCysAlaValSerValGlyProLysAsp.Iaddend.                .Iadd.115120125.Iaddend.                                                       .Iadd.MetThrAlaGlnPheAsnAsnLeuGlyValLeuHisValThrLysLys.Iaddend.                .Iadd.130135140.Iaddend.                                                       .Iadd.AsnMetMetGlyThrMetIleGlnLysLeuGlnArgGlnArgLeuArg.Iaddend.                .Iadd.145150155160.Iaddend.                                                    .Iadd.SerArgProGlnGlyLeuThrGluAlaGluGlnArgGluLeuGluGln.Iaddend.                .Iadd.165170175.Iaddend.                                                       .Iadd.GluAlaLysGluLeuLysLysValMetAspLeuSerIleValArgLeu.Iaddend.                .Iadd.180185190.Iaddend.                                                       .Iadd.ArgPheSerAlaPheLeuArgAlaSerAspGlySerPheSerLeuPro.Iaddend.                .Iadd.195200205.Iaddend.                                                       .Iadd.LeuLysProValThrSerGlnProIleHisAspSerLysSerProGly.Iaddend.                .Iadd.210215220.Iaddend.                                                       .Iadd.AlaSerAsnLeuLysIleSerArgMetAspLysThrAlaGlySerVal.Iaddend.                .Iadd.225230235240.Iaddend.                                                    .Iadd.ArgGlyGlyAspGluValTyrLeuLeuCysAspLysValGlnLysAsp.Iaddend.                .Iadd.245250255.Iaddend.                                                       .Iadd.AspIleGluValArgPheTyrGluAspAspGluAsnGlyTrpGlnAla.Iaddend.                .Iadd.260265270.Iaddend.                                                       .Iadd.PheGlyAspPheSerProThrAspValHisLysGlnTyrAlaIleVal.Iaddend.                .Iadd.275280285.Iaddend.                                                       .Iadd.PheArgThrProProTyrHisLysMetLysIleGluArgProValThr.Iaddend.                .Iadd.290295300.Iaddend.                                                       .Iadd.ValPheLeuGlnLeuLysArgLysArgGlyGlyAspValSerAspSer.Iaddend.                .Iadd.305310315320.Iaddend.                                                    .Iadd.LysGlnPheThrTyrTyrProLeuValGluAspLysGluGluValGln.Iaddend.                .Iadd.325330335.Iaddend.                                                       .Iadd.ArgLysArgArgLysAlaLeuProThrPheSerGlnProPheGlyGly.Iaddend.                .Iadd.340345350.Iaddend.                                                       .Iadd.GlySerHisMetGlyGlyGlySerGlyGlyAlaAlaGlyGlyTyrGly.Iaddend.                .Iadd.355360365.Iaddend.                                                       .Iadd.GlyAlaGlyGlyGlyGlySerLeuGlyPhePheProSerSerLeuAla.Iaddend.                .Iadd.370375380.Iaddend.                                                       .Iadd.TyrSerProTyrGlnSerGlyAlaGlyProMetGlyCysTyrProGly.Iaddend.                .Iadd.385390395400.Iaddend.                                                    .Iadd.GlyGlyGlyGlyAlaGlnMetAlaAlaThrValProSerArgAspSer.Iaddend.                .Iadd.405410415.Iaddend.                                                       .Iadd.GlyGluGluAlaAlaGluProSerAlaProSerArgThrProGlnCys.Iaddend.                .Iadd.420425430.Iaddend.                                                       .Iadd.GluProGlnAlaProGluMetLeuGlnArgAlaArgGluTyrAsnAla.Iaddend.                .Iadd.435440445.Iaddend.                                                       .Iadd.ArgLeuPheGlyLeuAlaGlnArgSerAlaArgAlaLeuLeuAspTyr.Iaddend.                .Iadd.450455460.Iaddend.                                                       .Iadd.GlyValThrAlaAspAlaArgAlaLeuLeuAlaGlyGlnArgHisLeu.Iaddend.                .Iadd.465470475480.Iaddend.                                                    .Iadd.LeuThrAlaGlnAspGluAsnGlyAspThrProLeuHisLeuAlaIle.Iaddend.                .Iadd.485490495.Iaddend.                                                       .Iadd.IleHisGlyGlnThrSerValIleGluGlnIleValTyrValIleHis.Iaddend.                .Iadd.500505510.Iaddend.                                                       .Iadd.HisAlaGlnAspLeuGlyValValAsnLeuThrAsnHisLeuHisGln.Iaddend.                .Iadd.515520525.Iaddend.                                                       .Iadd.ThrProLeuHisLeuAlaValIleThrGlyGlnThrSerValValSer.Iaddend.                .Iadd.530535540.Iaddend.                                                       .Iadd.PheLeuLeuArgValGlyAlaAspProAlaLeuLeuAspArgHisGly.Iaddend.                .Iadd.545550555560.Iaddend.                                                    .Iadd.AspSerAlaMetHisLeuAlaLeuArgAlaGlyAlaGlyAlaProGlu.Iaddend.                .Iadd.565570575.Iaddend.                                                       .Iadd.LeuLeuArgAlaLeuLeuGlnSerGlyAlaProAlaValProGlnLeu.Iaddend.                .Iadd.580585590.Iaddend.                                                       .Iadd.LeuHisMetProAspPheGluGlyLeuTyrProValHisLeuAlaVal.Iaddend.                .Iadd.595600605.Iaddend.                                                       .Iadd.ArgAlaArgSerProGluCysLeuAspLeuLeuValAspSerGlyAla.Iaddend.                .Iadd.610615620.Iaddend.                                                       .Iadd.GluValGluAlaThrGluArgGlnGlyGlyArgThrAlaLeuHisLeu.Iaddend.                .Iadd.625630635640.Iaddend.                                                    .Iadd.AlaThrGluMetGluGluLeuGlyLeuValThrHisLeuValThrLys.Iaddend.                .Iadd.645650655.Iaddend.                                                       .Iadd.LeuArgAlaAsnValAsnAlaArgThrPheAlaGlyAsnThrProLeu.Iaddend.                .Iadd.660665670.Iaddend.                                                       .Iadd.HisLeuAlaAlaGlyLeuGlyTyrProThrLeuThrArgLeuLeuLeu.Iaddend.                .Iadd.675680685.Iaddend.                                                       .Iadd.LysAlaGlyAlaAspIleHisAlaGluAsnGluGluProLeuCysPro.Iaddend.                .Iadd.690695700.Iaddend.                                                       .Iadd.LeuProSerProProThrSerAspSerAspSerAspSerGluGlyPro.Iaddend.                .Iadd.705710715720.Iaddend.                                                    .Iadd.GluLysAspThrArgSerSerPheArgGlyHisThrProLeuAspLeu.Iaddend.                .Iadd.725730735.Iaddend.                                                       .Iadd.ThrCysSerThrLysValLysThrLeuLeuLeuAsnAlaAlaGlnAsn.Iaddend.                .Iadd.740745750.Iaddend.                                                       .Iadd.ThrMetGluProProLeuThrProProSerProAlaGlyProGlyLeu.Iaddend.                .Iadd.755760765.Iaddend.                                                       .Iadd.SerLeuGlyAspThrAlaLeuGlnAsnLeuGluGlnLeuLeuAspGly.Iaddend.                .Iadd.770775780.Iaddend.                                                       .Iadd.ProGluAlaGlnGlySerTrpAlaGluLeuAlaGluArgLeuGlyLeu.Iaddend.                .Iadd.785790795800.Iaddend.                                                    .Iadd.ArgSerLeuValAspThrTyrArgGlnThrThrSerProSerGlySer.Iaddend.                .Iadd.805810815.Iaddend.                                                       .Iadd.LeuLeuArgSerTyrGluLeuAlaGlyGlyAspLeuAlaGlyLeuLeu.Iaddend.                .Iadd.820825830.Iaddend.                                                       .Iadd.GluAlaLeuSerAspMetGlyLeuGluGluGlyValArgLeuLeuArg.Iaddend.                .Iadd.835840845.Iaddend.                                                       .Iadd.GlyProGluThrArgAspLysLeuProSerThrGluValLysGluAsp.Iaddend.                .Iadd.850855860.Iaddend.                                                       .Iadd.SerAlaTyrGlySerGlnSerValGluGlnGluAlaGluLysLeuGly.Iaddend.                .Iadd.865870875880.Iaddend.                                                    .Iadd.ProProProGluProProGlyGlyLeuCysHisGlyHisProGlnPro.Iaddend.                .Iadd.885890895.Iaddend.                                                       .Iadd.GlnValHis.Iaddend.                                                       .Iadd.(2) INFORMATION FOR SEQ ID NO:3:.Iaddend.                                .Iadd.(i) SEQUENCE CHARACTERISTICS:.Iaddend.                                   .Iadd.(A) LENGTH: 969 amino acids.Iaddend.                                     .Iadd.(B) TYPE: amino acid.Iaddend.                                            .Iadd.(D) TOPOLOGY: unknown.Iaddend.                                           .Iadd.(ii) MOLECULE TYPE: protein.Iaddend.                                     .Iadd.(xi) SEQUENCE DESCRIPTION: SEQ ID NO:3:.Iaddend.                         .Iadd.MetAlaGluAspAspProTyrLeuGlyArgProGluGlnMetPheHis.Iaddend.                .Iadd.151015.Iaddend.                                                          .Iadd.LeuAspProSerLeuThrHisThrIlePheAsnProGluValPheGln.Iaddend.                .Iadd.202530.Iaddend.                                                          .Iadd.ProGlnMetAlaLeuProThrAlaAspGlyProTyrLeuGlnIleLeu.Iaddend.                .Iadd.354045.Iaddend.                                                          .Iadd.GluGlnProLysGlnArgGlyPheArgPheArgTyrValCysGluGly.Iaddend.                .Iadd.505560.Iaddend.                                                          .Iadd.ProSerHisGlyGlyLeuProGlyAlaSerSerGluLysAsnLysLys.Iaddend.                .Iadd.65707580.Iaddend.                                                        .Iadd.SerTyrProGlnValLysIleCysAsnTyrValGlyProAlaLysVal.Iaddend.                .Iadd.859095.Iaddend.                                                          .Iadd.IleValGlnLeuValThrAsnGlyLysAsnIleHisLeuHisAlaHis.Iaddend.                .Iadd.100105110.Iaddend.                                                       .Iadd.SerLeuValGlyLysHisCysGluAspGlyIleCysThrValThrAla.Iaddend.                .Iadd.115120125.Iaddend.                                                       .Iadd.GlyProLysAspMetValValGlyPheAlaAsnLeuGlyIleLeuHis.Iaddend.                .Iadd.130135140.Iaddend.                                                       .Iadd.ValThrLysLysLysValPheGluThrLeuGluAlaArgMetThrGlu.Iaddend.                .Iadd.145150155160.Iaddend.                                                    .Iadd.AlaCysIleArgGlyTyrAsnProGlyLeuLeuValHisProAspLeu.Iaddend.                .Iadd.165170175.Iaddend.                                                       .Iadd.AlaTyrLeuGlnAlaGluGlyGlyGlyAspArgGlnLeuGlyAspArg.Iaddend.                .Iadd.180185190.Iaddend.                                                       .Iadd.GluLysGluLeuIleArgGlnAlaAlaLeuGlnGlnThrLysGluMet.Iaddend.                .Iadd.195200205.Iaddend.                                                       .Iadd.AspLeuSerValValArgLeuMetPheThrAlaPheLeuProAspSer.Iaddend.                .Iadd.210215220.Iaddend.                                                       .Iadd.ThrGlySerPheThrArgArgLeuGluProValValSerAspAlaIle.Iaddend.                .Iadd.225230235240.Iaddend.                                                    .Iadd.TyrAspSerLysAlaProAsnAlaSerAsnLeuLysIleValArgMet.Iaddend.                .Iadd.245250255.Iaddend.                                                       .Iadd.AspArgThrAlaGlyCysValThrGlyGlyGluGluIleTyrLeuLeu.Iaddend.                .Iadd.260265270.Iaddend.                                                       .Iadd.CysAspLysValGlnLysAspAspIleGlnIleArgPheTyrGluGlu.Iaddend.                .Iadd.275280285.Iaddend.                                                       .Iadd.GluGluAsnGlyGlyValTrpGluGlyPheGlyAspPheSerProThr.Iaddend.                .Iadd.290295300.Iaddend.                                                       .Iadd.AspValHisArgGlnPheAlaIleValPheLysThrProLysTyrLys.Iaddend.                .Iadd.305310315320.Iaddend.                                                    .Iadd.AspIleAsnIleThrLysProAlaSerValPheValGlnLeuArgArg.Iaddend.                .Iadd.325330335.Iaddend.                                                       .Iadd.LysSerAspLeuGluThrSerGluProLysProPheLeuTyrTyrPro.Iaddend.                .Iadd.340345350.Iaddend.                                                       .Iadd.GluIleLysAspLysGluGluValGlnArgLysArgGlnLysLeuMet.Iaddend.                .Iadd.355360365.Iaddend.                                                       .Iadd.ProAsnPheSerAspSerPheGlyGlyGlySerGlyAlaGlyAlaGly.Iaddend.                .Iadd.370375380.Iaddend.                                                       .Iadd.GlyGlyGlyMetPheGlySerGlyGlyGlyGlyGlyGlyThrGlySer.Iaddend.                .Iadd.385390395400.Iaddend.                                                    .Iadd.ThrGlyProGlyTyrSerPheProHisTyrGlyPheProThrTyrGly.Iaddend.                .Iadd.405410415.Iaddend.                                                       .Iadd.GlyIleThrPheHisProGlyThrThrLysSerAsnAlaGlyMetLys.Iaddend.                .Iadd.420425430.Iaddend.                                                       .Iadd.HisGlyThrMetAspThrGluSerLysLysAspProGluGlyCysAsp.Iaddend.                .Iadd.435440445.Iaddend.                                                       .Iadd.LysSerAspAspLysAsnThrValAsnLeuPheGlyLysValIleGlu.Iaddend.                .Iadd.450455460.Iaddend.                                                       .Iadd.ThrThrGluGlnAspGlnGluProSerGluAlaThrValGlyAsnGly.Iaddend.                .Iadd.465470475480.Iaddend.                                                    .Iadd.GluValThrLeuThrTyrAlaThrGlyThrLysGluGluSerAlaGly.Iaddend.                .Iadd.485490495.Iaddend.                                                       .Iadd.ValGlnAspAsnLeuPheLeuGluLysAlaMetGlnLeuAlaLysArg.Iaddend.                .Iadd.500505510.Iaddend.                                                       .Iadd.HisAlaAsnAlaLeuPheAspTyrAlaValThrGlyAspValLysMet.Iaddend.                .Iadd.515520525.Iaddend.                                                       .Iadd.LeuLeuAlaValGlnArgHisLeuThrAlaValGlnAspGluAsnGly.Iaddend.                .Iadd.530535540.Iaddend.                                                       .Iadd.AspSerValLeuHisLeuAlaIleIleHisLeuHisSerGlnLeuVal.Iaddend.                .Iadd.545550555560.Iaddend.                                                    .Iadd.ArgAspLeuLeuGluValThrSerGlyLeuIleSerAspAspIleIle.Iaddend.                .Iadd.565570575.Iaddend.                                                       .Iadd.AsnMetArgAsnAspLeuTyrGlnThrProLeuHisLeuAlaValIle.Iaddend.                .Iadd.580585590.Iaddend.                                                       .Iadd.ThrLysGlnGluAspValValGluAspLeuLeuArgAlaGlyAlaAsp.Iaddend.                .Iadd.595600605.Iaddend.                                                       .Iadd.LeuSerLeuLeuAspArgLeuGlyAsnSerValLeuHisLeuAlaAla.Iaddend.                .Iadd.610615620.Iaddend.                                                       .Iadd.LysGluGlyHisAspLysValLeuSerIleLeuLeuLysHisLysLys.Iaddend.                .Iadd.625630635640.Iaddend.                                                    .Iadd.AlaAlaLeuLeuLeuAspHisProAsnGlyAspGlyLeuAsnAlaIle.Iaddend.                .Iadd.645650655.Iaddend.                                                       .Iadd.HisLeuAlaMetMetSerAsnSerLeuProCysLeuLeuLeuLeuVal.Iaddend.                .Iadd.660665670.Iaddend.                                                       .Iadd.AlaAlaGlyAlaAspValAsnAlaGlnGluGlnLysSerGlyArgThr.Iaddend.                .Iadd.675680685.Iaddend.                                                       .Iadd.AlaLeuHisLeuAlaValGluHisAspAsnIleSerLeuAlaGlyCys.Iaddend.                .Iadd.690695700.Iaddend.                                                       .Iadd.LeuLeuLeuGluGlyAspAlaHisValAspSerThrThrTyrAspGly.Iaddend.                .Iadd.705710715720.Iaddend.                                                    .Iadd.ThrThrProLeuHisIleAlaAlaGlyArgGlySerThrArgLeuAla.Iaddend.                .Iadd.725730735.Iaddend.                                                       .Iadd.AlaLeuLeuLysAlaAlaGlyAlaAspProLeuValGluAsnPheGlu.Iaddend.                .Iadd.740745750.Iaddend.                                                       .Iadd.ProLeuTyrAspLeuAspAspSerTrpGluAsnAlaGlyGluAspGlu.Iaddend.                .Iadd.755760765.Iaddend.                                                       .Iadd.GlyValValProGlyThrThrProLeuAspMetAlaThrSerTrpGln.Iaddend.                .Iadd.770775780.Iaddend.                                                       .Iadd.ValPheAspIleLeuAsnGlyLysProTyrGluProGluPheThrSer.Iaddend.                .Iadd.785790795800.Iaddend.                                                    .Iadd.AspAspLeuLeuAlaGlnGlyAspMetLysGlnLeuAlaGluAspVal.Iaddend.                .Iadd.805810815.Iaddend.                                                       .Iadd.LysLeuGlnLeuTyrLysLeuLeuGluIleProAspProAspLysAsn.Iaddend.                .Iadd.820825830.Iaddend.                                                       .Iadd.TrpAlaThrLeuAlaGlnLysLeuGlyLeuGlyIleLeuAsnAsnAla.Iaddend.                .Iadd.835840845.Iaddend.                                                       .Iadd.PheArgLeuSerProAlaProSerLysThrLeuMetAspAsnTyrGlu.Iaddend.                .Iadd.850855860.Iaddend.                                                       .Iadd.ValSerGlyGlyThrValArgGluLeuValGluAlaLeuArgGlnMet.Iaddend.                .Iadd.865870875880.Iaddend.                                                    .Iadd.GlyTyrThrGluAlaIleGluValIleGlnAlaAlaSerSerProVal.Iaddend.                .Iadd.885890895.Iaddend.                                                       .Iadd.LysThrThrSerGlnAlaHisSerLeuProLeuSerProAlaSerThr.Iaddend.                .Iadd.900905910.Iaddend.                                                       .Iadd.ArgGlnGlnIleAspGluLeuArgAspSerAspSerValCysAspThr.Iaddend.                .Iadd.915920925.Iaddend.                                                       .Iadd.GlyValGluThrSerPheArgLysLeuSerPheThrGluSerLeuThr.Iaddend.                .Iadd.930935940.Iaddend.                                                       .Iadd.SerGlyAlaSerLeuLeuThrLeuAsnLysMetProHisAspTyrGly.Iaddend.                .Iadd.945950955960.Iaddend.                                                    .Iadd.GlnGluGlyProLeuGluGlyLysIle.Iaddend.                                     .Iadd.965.Iaddend.                                                             __________________________________________________________________________ 

What is claimed as new and desired to be secured by Letters Patent of the United States is:
 1. A biologically pure protein, wherein said protein consists of the sequence shown in SEQ ID NO:1.
 2. A biologically pure protein, wherein said protein consists of the sequence shown in SEQ ID NO:2. 